Compilare: main.cpp: In function 'int main()': main.cpp:49:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int p = 0; p < str[1].length(); ++p) { ~~^~~~~~~~~~~~~~~~~ main.cpp:58:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < str[i].size(); ++j) { ~~^~~~~~~~~~~~~~~ main.cpp:30:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rebus.in", "r", stdin); ^ main.cpp:31:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rebus.out", "w", stdout); ^